M Block with Female Connector

Pre-Terminated to Make Your Job Easier

Low Price Guarantee

What's special about this wiring block?

  • Equipped with a prewired and pretested 25-pair female connector on left side fanning strip to hasten the connection of incoming pairs
  • Constructed of high impact, fire retardant UL 94V-0 plastic to meet code
  • Can be installed individually or in pairs for use in a single or cross-connect system
  • Includes 50 rows of clips, 25 on each side, to assist with a neat installation
  • Click for More Features

Leviton’s M Block with female connector is the perfect solution for completing a quick and reliable installation. The pre-terminated 25 pairs on one side allow you to save valuable time on the jobsite with setup and the quality materials are sure to keep your network running for years to come.


LE-40066-0MW M Block with female connector (66M1-50W) 10" H x 3-5/16" W x 1-3/16" D
  • Compact design is ideal for locations with limited space
  • Built-in fanning strip to help with distribution and organization of wires
  • 25 Pair connector has a hook and loop tie attached to provide additional cable management
  • Mounting holes on the top and bottom for ease of mounting onto a backboard
  • Phosphor bronze quick-connect insulation displacement 66-clips for electrical and mechanical stability


Part # LE-40066-0MW
Height 10"
Width 3-5/16"
Depth 1-3/16"
Material UL-94 V-0 plastic
Connector 50 rows of clips, 25 per side





Snap-On Cover for M BlocksSnap-On Cover for M Blocks
Made of transparent plastic, it easily permits the viewing of wiring and pair assignments without removal.
Bridging ClipsBridging Clips
Price per pack
Bridging clips press onto the two center slots in any row of a Split M block. If outside cable pairs are terminated on the left-hand clips and station equipment wire is terminated on the right-hand clips, then connections can quickly be made or eliminated by simply inserting or removing the bridging clips.
Modular AdaptersModular Adapters
Modular adapters plug into M blocks to convert 66-clip contacts to a modular jack for quick connection of equipment.
Wire Distribution SpoolWire Distribution Spools
From each
Facilitate routing and fanning of cable, cross-connections, and jumper wires to any connection apparatus. Mount conveniently on backboard of distribution frame.
Leviton Split M BlockSplit M Block: 50-Pair
The Split M block contains 50 rows of clips, but instead of one 4-slot clip as the 25 pair M Block, each row contains two separate 2-slot clips.
Leviton M Block with Female & Male ConnectorsM Block with Female & Male Connectors
The 50-pair M block contains prewired, pretested 25-pair female connector on left and male connector on the right for the quickest installation. Easily plug in the connectors and insert bridging clips to complete the connections.

Do you have any question about this product?
Let our experts and customers resolve all your doubts

Did you know that we can give you a quote for most of our products, including shipping?

You can also call us toll free 866.222.0030

What can make this page better?

We do everything we can think of to provide you with the product specs, images and ordering info you need, but if we're missing something or still have room to improve, please let us know. Your comments, suggestions and questions are the best tools we have for serving you better!